"The service team reply misunderstood the situation. Unlock tool is unavailable at this moment but we are allowing the possibility to unlock, please stay tuned."
ASUS killed off bootloader unlocking back in May and has yet to fix that. If you try right now, you cannot unlock your ASUS phone. They may fix that in the future and are saying that's the case but as of right now, you can't.
Part of their Zenfone marketing is keeping "legacy" features like headphone jack and small form factor, they should allow unlocking. Hopefully they'll follow through and allow you to modify the device that you purchased.
Hopefully they keep to their word. Could be another Nokia or Huawei situation here. I'm still upset about the Huawei one, just after I unlocked my phone it was stolen, and by the time I got a replacement the unlock service was taken down.
I've had the ROG 2, and now the ROG 6. Up there as my favorite phones ever. Even if you aren't a phone gamer, it's great for Android Phone power users too.
Surprisingly, though I didn't originally buy with it in mind, the second side USB-C port quickly became one of my favorite features.